36 and 72 both are.
The number is 1,144.
It is: 1144
1144
1020, 1040, 1060 and 1080.
1100
1000, 1020, 1040, 1060, 1080, and 1100
342 = 1156 which is between 1100 and 1200 and is certainly a square number.
The answer between 1 and 1000 is 840, but what about 1 and 1100?
There are seven: 1057, 1064, 1071, 1078, 1085, 1092, 1099.
1,001 1,012 1,023 1,034 1,045 1,056 1,067 1,078 1,089
1001, 1012, 1023, 1034, 1045, 1056, 1067, 1078, 1089, 1100
Two: 1020 and 1080.