EXPONENTIAL : Characterized by or being an extremely rapid increase (as in size or extent) Rising or expanding at a steady, rapid rate. Increasing by extraordinary proportions.
Did the crowd number “about five thousand” or were there many more?
The “MEN” (John 6:10) numbered about 5,000. Including the “WOMEN AND CHILDREN”, the crowd probably numbered about 15,000 or more. (Bibleversestudy) (Matthew 14:21, John 6:10)

“Come, follow Me,” Jesus said, “and I will make you fishers of men.” And at once they left their nets and followed,”” Matthew 4:19-20

“Then, as soon as they had come to land, they saw a fire of coals there, and fish laid on it, and bread. Jesus said to them, “Bring some of the fish which you have just caught.” Simon Peter went up and dragged the net to land, full of large fish,”ONE HUNDRED and FIFTY THREE”; and although there were so many, the net was not broken.” John 21:9-11

(In Hebrew, every letter has a number attached to it. The Hebrews used their alphabet as a numbering system. The numbers attached to the letters in a Hebrew word could be added together to give a numerical total. The number 153 is the numerical total for the Hebrew words “Ani Elohim”–“I AM GOD.” When Jesus caused the disciples to catch exactly 153 fish, He was declaring to them that not only was He the Son of God, but that He was God Himself.) (Versebyverseministry)

“And they went forth, and preached every where, The LORD working with them, and confirming the word with signs following. Amen.” Mark 16:20

“Enlarge the place of thy tent, and let them stretch forth the curtains of thine habitations; spare not, lengthen thy cords, and strengthen thy stakes.” Isaiah 54:2

“The LORD shall increase you more and more, you and your children. Ye are blessed of The LORD which made heaven and earth.” Psalm 115:14-15

“For the promise is unto you, and to your children, and to all that are afar off, even as many as The LORD our God shall call.” Acts 2:39

“God did extraordinary miracles through the hands of Paul, so that even handkerchiefs and aprons that had touched him were taken to the sick, and the diseases and evil spirits left them.” Acts 19:11-12

“Wherever the River flows, there will be swarms of living creatures and a great number of FISH, because it flows there and makes the waters fresh; so wherever the River flows, everything will flourish.” Ezekiel 47:9

“And he showed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb. In the midst of the street of it, and on either side of the river, was there the tree of life, which bare twelve manner of fruits, and yielded her fruit every month: and the leaves of the tree were for the healing of the nations.” Revelation 22:1-2

“Lifting up His eyes, then, and seeing that a large crowd was coming toward Him, Jesus said to Philip, “Where are we to buy bread, so that these people may eat?” He said this to test him, for He Himself knew what He would do.Philip answered Him, “Two hundred denarii worth of bread would not be enough for each of them to get a little.” One of His disciples, Andrew, Simon Peter’s brother, said to him, “There is a boy here who has five barley loaves and two fish, but what are they for so many?” Jesus said, “Have the people sit down.” Now there was much grass in the place. So the men sat down, about five thousand in number. Jesus then took the loaves, and vwhen he had given thanks, he distributed them to those who were seated. So also the fish, as much as they wanted. And when they had eaten their fill, he told his disciples, “Gather up the leftover fragments, that nothing may be lost.” So they gathered them up and filled twelve baskets with fragments from the five barley loaves left by those who had eaten.” John 6:5-13